/*function MortCalc()
{
 	var principal = document.getElementById("LoanAmount");
	alert(principal.value);

}*/
function MortCalc()
{
	form = document.mortgage
	LoanAmount= form.LoanAmount.value
	DownPayment= form.DownPayment.value
	if (DownPayment == "")  
	{
		DownPayment = "0"
	}	

	AnnIR = form.InterestRate.value/100

	Years= form.NumOfYrs.value
	
	MonthRate=AnnIR/12
	NumPayments=Years*12
	Prin=LoanAmount-DownPayment
	
	MonthPayment=Math.floor((Prin*MonthRate)/(1-Math.pow((1+MonthRate),(-1*NumPayments)))*100)/100
	
	form.NumberOfPayments.value=NumPayments
	form.MonthlyPayment.value=MonthPayment
}